In order to add target="_blank" to a file link, I had to replicate most of template_preprocess_file_link. The documentation for $variables['attributes'] ("An associative array of attributes to be placed in the a tag") is wrong after 📌 Use CSS for file icons in file fields Fixed
Add URL options variable to the template which includes attributes. See #29
This may be deprecated eventually: #2615660: Allow Link and LinkGenerator::generate() to provide attributes. →
Review the patch and change record.
Needs work
10.1 ✨
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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@imclean I do think this could use a test case. To least show that altering works as expected.